<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="(item,index) in carInfoList" :key="item.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="item.isChecked==1" @change="updateChecked(item,$event)">
          </li>
          <li class="cart-list-con2">
            <img :src="item.imgUrl">
            <div class="item-msg">{{ item.skuName }}</div>
          </li>

          <li class="cart-list-con4">
            <span class="price">{{ item.cartPrice }}.00</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="handler('mins',-1,item)">-</a>
            <input autocomplete="off" type="text" :value="item.skuNum" minnum="1" class="itxt"
                   @change="handler('change',$event.target.value*1,item)">
            <a href="javascript:void(0)" class="plus" @click="handler('add',1,item)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ item.cartPrice * item.skuNum }}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteCarBySkuId(item)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>

      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isAllCheck&&carInfoList.length>1" @click="updateAllCartChecked">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAllChecked">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>0</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapGetters } from 'vuex'
// 防止用户点击加减过快引入节流
import throttle from 'lodash/throttle'

export default {
  name: 'ShopCart',
  mounted () {
    this.getData()
  },
  computed: {
    ...mapGetters(['carList']),
    // 购物车数据
    carInfoList () {
      return this.carList.cartInfoList || []
    },
    totalPrice () {
      let sum = 0
      // console.log(this.carInfoList)
      this.carInfoList.forEach(item => {
        sum += item.skuNum * item.skuPrice
      })
      return sum
    },
    isAllCheck () {
      //判断每一个属性isChecked都为1则是true,否则是false
      return this.carInfoList.every(item => {
        item.isChecked == 1
      })
    }
  },
  methods: {
    getData () {
      this.$store.dispatch('getCarList')
    },
    handler: throttle(async function (type, disNum, item) {
      //根据接口要求，disNum为1是加1，为-1是减1，为0是不变
      switch (type) {
        case 'add':
          disNum = 1
          break
        case'mins':
          disNum = item.skuNum > 1 ? -1 : 0
          break
        case 'change':
          //判断用户输入非数字
          disNum = (isNaN(disNum) || disNum < 1) ? 0 : parseInt(disNum) - item.skuNum
          break
      }
      //派发action
      try {
        await this.$store.dispatch('addOrUpdataShopCart', { skuId: item.skuId, skuNum: disNum })
        this.getData()
      } catch (error) {
      }
    }, 500),
    //删除
    async deleteCarBySkuId (item) {
      try {
        await this.$store.dispatch('deleteCarBySkuId', item.skuId)
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    },
    //修改产品勾选状态
    async updateChecked(cart, event) {
      //带给服务器的参数isChecked，不是布尔值，应该是0|1
      try {
        //如果修改数据成功，再次获取服务器数据（购物车）
        let isChecked = event.target.checked ? "1" : "0";
        await this.$store.dispatch("updateCheckedById", {
          skuId: cart.skuId,
          isChecked,
        });
        this.getData();
      } catch (error) {
        //如果失败提示
        // alert(error.message);
      }
    },
    //多选删除
    async deleteAllChecked(){
      try{
        await this.$store.dispatch('deleteAllCheckedCart')
        this.getData()
      }catch (error){
        alert(error.message);
      }
    },
    async updateAllCartChecked(event){
      try{
        let isChecked = event.target.checked?"1":"0"
        await this.$store.dispatch('updateAllCartChecked',isChecked)
        this.getData()
      }catch (error){
        alert(error.message);
      }
    }
  }
}
</script>

<style lang="scss" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;

      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }


        .cart-list-con4 {
          width: 10%;

        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>
